<!DOCTYPE html>
<html lang='en'>

<head>
    <meta charset='UTF-8'>
    <meta http-equiv='X-UA-Compatible' content='IE=edge'>
    <meta name='viewport' content='width=device-width, initial-scale=1.0'>
    <title>Document</title>
    <script src='../vue.global.js'></script>
</head>

<body>
    <div id='app'></div>
    <script>
        const app = Vue.createApp({
            data() {
                return { count: 4 }
            },
            methods: {
                increment() {
                    // `this` 指向该组件实例
                    this.count++
                }
            }
        })

        const vm = app.mount('#app')

        console.log(vm.count) // => 4

        vm.increment()

        console.log(vm.count) // => 5
    </script>
</body>

</html>